ios - Xcode 6 - 在设备上运行应用程序崩溃

Question

当我在模拟器上运行我的应用程序时，它工作正常。然而，当我在 iPhone 上运行它时，应用程序可以正常工作，但有时会暂停并崩溃？我该如何解决这个问题？我可以去哪里诊断问题？

我在主页的背景中添加了过渡图像。我使用了 Instruments，在 Allocations->Category 下，它使用了 PNG_Data 中的大量内存。我只是在我的 Xcode 项目中包含大约十二张 .png 照片。下面是使用图像的代码。

extension Array {
func shuffled() -> [T] {
    var list = self
    for i in 0..<(list.count - 1) {
        let j = Int(arc4random_uniform(UInt32(list.count - i))) + i
        swap(&list[i], &list[j])
    }
    return list
}
}

import Foundation

import UIKit

class ViewController: UIViewController  {

@IBAction func unwindSegue(segue: UIStoryboardSegue) {

}   
@IBOutlet weak var imageView: UIImageView!

// Array of images
let images = [
    UIImage(named: "nature1@2x.png")!,
    UIImage(named: "nature2@2x.png")!,
    UIImage(named: "desk2@2x.png")!,
    UIImage(named: "new_york8@2x.png")!,
    UIImage(named: "new_york9@2x.png")!,
    UIImage(named: "new_york10@2x.png")!,
    UIImage(named: "new_york11@2x.png")!,
    UIImage(named: "new_york14@2x.png")!,
    UIImage(named: "new_york15@2x.png")!,
    UIImage(named: "rainy_window1@2x.png")!,
    UIImage(named: "rainy_window2@2x.png")!,
    UIImage(named: "new_york16@2x.png")!,
    UIImage(named: "new_york17@2x.png")!,
    UIImage(named: "wall_st2@2x.png")!]

// Setting durations and intervals for transitions
var index = 0
let animationDuration: NSTimeInterval = 1.5
let switchingInterval: NSTimeInterval = 4


// VIEW DID LOAD
override func viewDidLoad() {
    super.viewDidLoad()

    imageView.image = images[index++]
    animateImageView()


}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    UIView.animateWithDuration(2.5, animations: {()-> Void in
        self.logo.alpha = 1.0})
}

// Function that animates the background
func animateImageView() {
    CATransaction.begin()

    CATransaction.setAnimationDuration(animationDuration) // passing in animationDuration
    CATransaction.setCompletionBlock {
        let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(self.switchingInterval * NSTimeInterval(NSEC_PER_SEC)))
        dispatch_after(delay, dispatch_get_main_queue()) {
            self.animateImageView()
        }
    }

    let transition = CATransition()
    transition.type = kCATransitionFade // the type of transition

    var new_images = images.shuffled() // SHUFFLING the images array

    imageView.layer.addAnimation(transition, forKey: kCATransition)
    imageView.image = new_images[index]

    CATransaction.commit()

    index = index < images.count - 1 ? index + 1 : 0
}

Answer 1

这是一件非常愚蠢的事情:

let images = [
    UIImage(named: "nature1@2x.png")!,
    UIImage(named: "nature2@2x.png")!,
    UIImage(named: "desk2@2x.png")!,
    UIImage(named: "new_york8@2x.png")!,
    UIImage(named: "new_york9@2x.png")!,
    UIImage(named: "new_york10@2x.png")!,
    UIImage(named: "new_york11@2x.png")!,
    UIImage(named: "new_york14@2x.png")!,
    UIImage(named: "new_york15@2x.png")!,
    UIImage(named: "rainy_window1@2x.png")!,
    UIImage(named: "rainy_window2@2x.png")!,
    UIImage(named: "new_york16@2x.png")!,
    UIImage(named: "new_york17@2x.png")!,
    UIImage(named: "wall_st2@2x.png")!]

基本上你是在说，“加载所有这些图像并同时保留它们。”图像巨大，所以内存自然会耗尽。

创建一个图像名称数组很好，因为名称只是很小的字符串；那么为什么不这样做呢？然后仅在您真正需要时才加载一个，以将其显示在界面中。